Commutator.



PATENTED AUG. 4, 1908.

HENSLEY. GOMMUTATOR.

APPLICATION FILED OCT. 18, 1907.

Big. 4. Big 5:

WITNESSES:

WILLIAM T. HENSLEY, OF WILKINSBURG, PENNSYLVANIA, ASSIGNOR TOWESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

COMMUT ATOR Specification of Letters Patent.

Patented Aug. 4, 1908.

Application filed. October 18, 1907. Serial No. 398,035.

To all whom it may concern:

Be it known that I, WILLIAM T. HENSLEY, a citizen of the United States, and a resident of Wilkinsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Commutators, of which the following is a specification.

My invention relates to dynamo-electric machines, and it has for its object to provide improved means for securing necks or connecting strips to commutator bars.

In dynamo-electric machines, the outside diameter of the commutator cylinder is usually considerably less than that of the armature core with which it is associated. Oonsequently, it is necessary to provide adequate means for establishing electrical connections between the extremities of the armature coils and the commutator bars, and it is specially desirable that these connections shall be mechanically rigid and durable.

My invention is illustrated in the accompanying drawings, in which Figure 1 is a side elevation, partially in section, of a supporting structure and a single commutator bar to which a neck or connecting strip is secured in accordance therewith. 7, Figs. 2, 3, 4, and 5 are detail views of the bar and neck shown in Fig. 1.

Referring to the drawings, a commutator bar 1 is supported in a well known manner by clamping V-rings 2 and 3 and a neck or connecting strip 4 is secured to the bar, as hereinafter set forth.

A recess 5 is milled in one side of the bar, near its inner end, and a hole 6 is bored through the bar concentric with the curved side of the recess. The neck or strip 4 is provided with a projection 7 to closely fit into the hole 6 in the bar, it being so located that the end of the neck will fit the curved portion of the recess.

The recess 5 may be machined in any suitable manner, this process being preferably accomplished, after the hole 6 has been drilled through the bar in the desired position, by means of an end mill the outside diameter of which corresponds to the width of the neck. The neck or strip may be properly cut and the projection 7 formed by a simple punching process. The thickness of the neck should preferably correspond, as above indicated, to the depth of the recess 5 in the bar so that when the parts are assembled the surface of the strip or neck will be flush with the surface of the bar. perfect electrical connection, the two parts may be soldered together.

The center line of the neck or strip 4 may or may not be perpendicular to the contact surface of the bar to which it is secured, this angle being suited to the machine with which the commutator is used and being determined by the path of the milling cutter when the recess 5 is cut in the bar.

The hole 6 may be bored only part way through the bar, thereby forming an inner recess that is adapted to receive the projection 7 from the neck and it is conceivable that various modifications in the size and arrangement of parts may be effected within the scope of my invention, and I desire that only such limitation shall be imposed as are indicated in the appended claims' I claim as my invention:

1. The combination with a commutator bar having a recess in one side and a hole between the bottom of the recess and the other side, of a strip or neck one end of which fits into the recess and the hole in the bar.

2. The combination with a commutator bar having a recess in one side near its inner end, and a hole concentric with the recess and extending from its side wall to the other side of the bar, of a strip or neck fitted into the recess and having a projection that engages the hole in the bar.

3. The combination with a commutator bar having a recess in one side near its inner end and terminating in the contact edge of the bar and a hole between the bottom of the recess and the other side, the inner end of the recess being concentric with the hole, of a strip or neck fitted into the recess and having a punched projection to engage the hole, the thickness of the strip or neck being substantially equal to the depth of the recess.

4. A commutator bar provided with a side recess having an inner curved end and a hole concentric with said end, and a strip or neck fitted into said recess and having a side pr0- jection that fits into said hole.

In order to provide a more 5. The combination With a commutator In testimony whereof, I have hereunto bar having a recess in oneside and a smaller subscribed my name this 8th day of October, recess or hole extending from its side Wall 1907. towards the other side of the bar, of a strip or WILLIAM T. HENSLEY. 5 neck fitted into the recess and having a pro- WVitnesses:

j ection that engages the hole or smaller recess T. P. MoDERMoTT, Jr.,

in the bar. BIRNEY HINES. 

